U2 is a rock group that put together in Dublin, Ireland in 1976. The band consists of Bono (vocals and rhythm guitar), The Edge (guitar, keyboards, and vocals), Adam Clayton (bass guitar), and Larry Mullen, Jr. (drums and percussion).

The ensemble put together in 1976 when the members were teenagers with limited musical proficiency and experience, but by the mid-1980s, they had gave us several units and become a top international act. Their success as a live lineup was greater than their success at selling records until their 1987 record The Joshua Tree, which, according to Rolling Stone, elevated the band's reputation "from heroes to superstars". In the 1990s, U2 responded to the dance and alternative rock revolutions and their own sense of musical stagnation by reinventing themselves, beginning with their 1991 album Achtung Baby and the accompanying Zoo television Tour. Since 2000, U2 have pursued a more conventional rock style of music that retains the status of their previous musical explorations.

U2 have put forth 12 studio albums, with worldwide sales totaling more than 145 million records, and they have won 22 Grammy Awards, more than any other band. In 2005, the ensemble were inducted into the Rock and Roll Hall of Fame in their first year of eligibility. Rolling Stone magazine listed U2 at #22 in its list of the 100 greatest performers of all time. Throughout their career, as a ensemble and as individuals, they have campaigned for human rights and charitable aid causes, which included Amnesty International, the ONE Campaign, Product Red, and Bono's DATA (Debt, AIDS, Trade in Africa) campaign.